Vision testing is a process used to assess a person's eyesight and overall visual health. It typically involves a series of examinations that measure how well a person can see at various distances, identify colors, and detect any potential vision problems. Common tools used in vision testing include the Snellen chart for measuring visual acuity and ophthalmoscopes for examining the internal structures of the eye. These tests are important for diagnosing conditions such as nearsightedness, farsightedness, and astigmatism. Regular vision testing is recommended for people of all ages, as early detection of vision issues can lead to more effective treatment and better eye health.